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Old 08-20-2012, 10:13 AM   #1
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Plug Question

This plug is in an RV now, not very familiar with the 4 prung plugs so we need some help here please.
the main box is set for 30 AMP but this seems to be a 50Amp plug or this is just an old 30A plug?
I found this to compare but not sure..
50 Amp 4-prong Straight Blade Male Plug NEMA 14-50-RJBP1450 at The Home Depot
thanks again
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Old 08-20-2012, 10:26 AM   #2
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The 30A 120V RV-use plug is 3 prongs, not 4. I agree, that looks like a 50A plug in the picture. *IF* it's wired correctly, it could supply your trailer if plugged into a 50A outlet, but I would want to determine that it's wired correctly or that the trailer wiring had been upgraded to properly handle 50A service before I plugged it in.

Here is a useful site with lots of info about RV electrical systems. Here is a link directly to the 30A page which has pictures of 30A plugs and receptacles.
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Old 08-20-2012, 10:34 AM   #3
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To second DKB_SATX post above, the plug shown is more commonly used to connect to a 50 Amp, 240 Volt circuit. A standard 30 Amp RV outlet is wired to 120 Volts.

The previous owner may have put this plug on the cable--connected to only one side of the line to get 120 Volts--in order to plug it into a clothes dryer or arc welder outlet he happened to have handy. But make sure before you plug it in!
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Old 08-20-2012, 10:38 AM   #4
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Hi Guys
Well based on the fact that the main distribution panel is set up for 30Amp I'm assuming that is still a 30AM connection from a 50A plug,
I guess we need to open it so see if there is 3 or4 wires..
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Old 08-21-2012, 03:20 PM   #5
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DKB_SATX
Thanks for the link, very useful.
Nuvite-F
It seems like you were right about the connection to 1 pole.


As it can be seen in the pics only 3 wires, so is a 120V 30A ?
Got this adapter in walmart to test the electrical in case it was wired as 50Amp, would the adaptor still work or should we just replace the plug with a 3 prong 30A?


Thanks again
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Old 08-21-2012, 05:30 PM   #6
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I would just change the plug head. Less then $20 at any hardware store. Yes the plug on it would work since they only have it wired to one leg, but it is being powered from a 50 amp breaker, not a 30 amp. That adapter you bought would also work fine.
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Old 08-22-2012, 09:10 PM   #7
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Quote:
Originally Posted by tinyhome View Post
I would just change the plug head. Less then $20 at any hardware store. Yes the plug on it would work since they only have it wired to one leg, but it is being powered from a 50 amp breaker, not a 30 amp. That adapter you bought would also work fine.
Thanks for the input, we are currently looking on ebay for a good 30A plug but will try the adaptor and see ehats going on.
Most likely NuviteF was right regarding...: The previous owner may have put this plug on the cable--connected to only one side of the line to get 120 Volts--in order to plug it into a clothes dryer or arc welder outlet he happened to have handy. But make sure before you plug it in!
Thanks again guys
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